Same basic convo, as far as "if you're only going to have one, make it a good one."
But more emphasis on hurting things effectively. Mages can stand to put a few points into a sidearm of some kind, b/c they can always resort to Lightning Bolts and Fireballs if they need.
When people stop talking and start shooting, the Face becomes just-another-body. So either you need a decent weapon so you can contribute to the fight. Or you need a decent hiding spot so you can avoid dying.
I'd put the Face in the same boat as the Decker / TM when it comes to lead flying. Which is why I went with the Predator V, using either APDS or Shock ammo. If you want to play nice, and potentially interrogate someone afterwards, use Shock. If you want to play rough, use APDS.